look at the Related Questions from last Friday
http://www.jiskha.com/display.cgi?id=1491587591
A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this situation. (c) Calculate the magnitude and direction of the elevator’s acceleration.
2 answers
Yes, it does look familiar :)